Birth control fail - what symptoms?

For those that were on birth control (whether it be the pill or any other mind) and still got pregnant, what were some of the symptoms you had? How long were you on birth control when it happened? If it was the pill, did you take it every day at the same time and it still fail?

I’m sure that I’m overthinking and just spooking myself. I’ve been feeling shitty this past week, and just have a weird feeling, the same I did when I first got pregnant with my son.

So I’m just curious for some stories of when it did fail.